dcrat | c0d51cad38cd578ac0f62737185d0e15184843b8a118bb978d11d9e86998eef3

Analysis

max time kernel
117s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
25-11-2024 04:51

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General

Target

11DA048860021B6C22E171032E48B023.exe
Size

1.1MB
MD5

11da048860021b6c22e171032e48b023
SHA1

b3b636a8bd17223454b4522fdbdb4863e0c4a565
SHA256

c0d51cad38cd578ac0f62737185d0e15184843b8a118bb978d11d9e86998eef3
SHA512

09b8bc3f1fa034d28a14e0fc5e44722ee84cfd9b32dc7887674100d967b3c9232d7ae42156c8d45050ea781ba87a3ee29a54bfc04bef98c6e5f6d9123444509f
SSDEEP

24576:U2G/nvxW3Ww0tpI7rd5XFM2cxARnZ0S/J1:UbA30pILXZjv

Score

10^/10

dcrat discovery infostealer rat

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat
Dcrat family
dcrat

Process spawned unexpected child process 30 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2884	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2876	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2220	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2868	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2660	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2616	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2684	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3068	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3048	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1804	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	236	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2404	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1752	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1144	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1428	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1548	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2132	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2396	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1928	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1916	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2672	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2572	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2700	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3016	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2284	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2924	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2600	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1836	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1004	2764	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1152	2764	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x000700000001925e-12.dat	dcrat
behavioral1/memory/2236-13-0x00000000002A0000-0x0000000000376000-memory.dmp	dcrat
behavioral1/memory/1000-40-0x0000000000310000-0x00000000003E6000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2236	chainMonitor.exe
1000	taskhost.exe

Loads dropped DLL 2 IoCs

pid	Process
2796	cmd.exe
2796	cmd.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	C:\Program Files\Google\Chrome\Application\services.exe	chainMonitor.exe
File opened for modification	C:\Program Files\Google\Chrome\Application\services.exe	chainMonitor.exe
File created	C:\Program Files\Google\Chrome\Application\c5b4cb5e9653cc	chainMonitor.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\Registration\CRMLog\explorer.exe	chainMonitor.exe
File created	C:\Windows\Registration\CRMLog\7a0fd90576e088	chainMonitor.exe
File created	C:\Windows\TAPI\wininit.exe	chainMonitor.exe
File created	C:\Windows\TAPI\56085415360792	chainMonitor.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	11DA048860021B6C22E171032E48B023.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 30 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2884	schtasks.exe
2396	schtasks.exe
2700	schtasks.exe
2876	schtasks.exe
2220	schtasks.exe
1836	schtasks.exe
1004	schtasks.exe
2868	schtasks.exe
2672	schtasks.exe
2924	schtasks.exe
2600	schtasks.exe
2660	schtasks.exe
2616	schtasks.exe
2684	schtasks.exe
3016	schtasks.exe
1752	schtasks.exe
1428	schtasks.exe
3068	schtasks.exe
3048	schtasks.exe
2572	schtasks.exe
1152	schtasks.exe
1804	schtasks.exe
1916	schtasks.exe
2284	schtasks.exe
236	schtasks.exe
2404	schtasks.exe
1144	schtasks.exe
1548	schtasks.exe
2132	schtasks.exe
1928	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2236	chainMonitor.exe
1000	taskhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2236	chainMonitor.exe
Token: SeDebugPrivilege	1000	taskhost.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1716 wrote to memory of 2992	1716	11DA048860021B6C22E171032E48B023.exe	30
PID 1716 wrote to memory of 2992	1716	11DA048860021B6C22E171032E48B023.exe	30
PID 1716 wrote to memory of 2992	1716	11DA048860021B6C22E171032E48B023.exe	30
PID 1716 wrote to memory of 2992	1716	11DA048860021B6C22E171032E48B023.exe	30
PID 2992 wrote to memory of 2796	2992	WScript.exe	32
PID 2992 wrote to memory of 2796	2992	WScript.exe	32
PID 2992 wrote to memory of 2796	2992	WScript.exe	32
PID 2992 wrote to memory of 2796	2992	WScript.exe	32
PID 2796 wrote to memory of 2236	2796	cmd.exe	34
PID 2796 wrote to memory of 2236	2796	cmd.exe	34
PID 2796 wrote to memory of 2236	2796	cmd.exe	34
PID 2796 wrote to memory of 2236	2796	cmd.exe	34
PID 2236 wrote to memory of 1000	2236	chainMonitor.exe	66
PID 2236 wrote to memory of 1000	2236	chainMonitor.exe	66
PID 2236 wrote to memory of 1000	2236	chainMonitor.exe	66

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\11DA048860021B6C22E171032E48B023.exe
"C:\Users\Admin\AppData\Local\Temp\11DA048860021B6C22E171032E48B023.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1716
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\blockrefSessionBrokerDll\5sVJrvWE.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2992
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\blockrefSessionBrokerDll\jNiINMcACfpGfudqTH4IxZpVWTbF.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2796
  - - C:\blockrefSessionBrokerDll\chainMonitor.exe
      "C:\blockrefSessionBrokerDll\chainMonitor.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2236
    - - C:\Recovery\20e7eb62-69f6-11ef-be0c-62cb582c238c\taskhost.exe
        
        "C:\Recovery\20e7eb62-69f6-11ef-be0c-62cb582c238c\taskhost.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1000

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 13 /tr "'C:\Program Files\Google\Chrome\Application\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2884

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Program Files\Google\Chrome\Application\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2876

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 6 /tr "'C:\Program Files\Google\Chrome\Application\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2220

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 7 /tr "'C:\Recovery\20e7eb62-69f6-11ef-be0c-62cb582c238c\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2868

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Recovery\20e7eb62-69f6-11ef-be0c-62cb582c238c\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2660

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 6 /tr "'C:\Recovery\20e7eb62-69f6-11ef-be0c-62cb582c238c\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2616

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 5 /tr "'C:\Recovery\20e7eb62-69f6-11ef-be0c-62cb582c238c\taskhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2684

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Recovery\20e7eb62-69f6-11ef-be0c-62cb582c238c\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3068

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 14 /tr "'C:\Recovery\20e7eb62-69f6-11ef-be0c-62cb582c238c\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3048

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 5 /tr "'C:\Windows\TAPI\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1804

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Windows\TAPI\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:236

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 9 /tr "'C:\Windows\TAPI\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2404

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 11 /tr "'C:\blockrefSessionBrokerDll\cmd.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1752

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\blockrefSessionBrokerDll\cmd.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1144

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 9 /tr "'C:\blockrefSessionBrokerDll\cmd.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1428

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 6 /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\WmiPrvSE.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2132

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 12 /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2396

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 11 /tr "'C:\Windows\Registration\CRMLog\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1928

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\Registration\CRMLog\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1916

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 10 /tr "'C:\Windows\Registration\CRMLog\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2672

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 14 /tr "'C:\MSOCache\All Users\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2572

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\MSOCache\All Users\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2700

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 6 /tr "'C:\MSOCache\All Users\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3016

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 14 /tr "'C:\Users\All Users\Desktop\cmd.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2284

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Users\All Users\Desktop\cmd.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2924

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmdc" /sc MINUTE /mo 14 /tr "'C:\Users\All Users\Desktop\cmd.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2600

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 5 /tr "'C:\blockrefSessionBrokerDll\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1836

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\blockrefSessionBrokerDll\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1004

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 6 /tr "'C:\blockrefSessionBrokerDll\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1152

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\blockrefSessionBrokerDll\5sVJrvWE.vbe

Filesize
229B

MD5
7533c94864b144aa157dbd00f03e9871

SHA1
807bad6d8cb143e2fac7ec32a6e07a4016af308d

SHA256
1dceabad90f9b4e74e59d62eebbc86662708d2c28761074e8b4fd73aa73f60aa

SHA512
3d536e931dadb7d6efc079fc9ff336ee4f2c7a291fcd1df7139c565e74d73e4c12745b886dbb746f060cd46c36cb3d774bc2b9f3a5407a737cb94ac44ed70f8c

Download Submit
C:\blockrefSessionBrokerDll\chainMonitor.exe

Filesize
828KB

MD5
f6b809fa6bd0e72435fab78e9744ccd7

SHA1
52749158484cf20a6511fcd36fda0e8100ebe316

SHA256
af8a81f4387ba5ebe96f5111d56b65585c194602e5bd147997eab1b6e28ae7b2

SHA512
12c63edcd1f347b519da80c814fcf3640294fdbd2482a7be4da4d20f8f5d785d2e97f784df39ad28b317d2db3cc43d904c5584fc9eea2c1f1df01b999362adf9

Download Submit
C:\blockrefSessionBrokerDll\jNiINMcACfpGfudqTH4IxZpVWTbF.bat

Filesize
46B

MD5
6f0b3744c91bc8641c6cef0ae9be66b5

SHA1
5e45aef1422d839f27a9e73b395c58eeab7ae476

SHA256
6442de1cdf0bf9500de8b74c00506a7d84193b3780f9242f55497335526aad5c

SHA512
97089e966a4969391aa2fa10d0693c103a16eea70bfbc01481ecda46ae6953e3a25abf3034500e275cc60e0e8de6f95435b2ba2c9df2cda5bf58685af4cba8e0

Download Submit
memory/1000-40-0x0000000000310000-0x00000000003E6000-memory.dmp

Filesize
856KB

Download
memory/2236-13-0x00000000002A0000-0x0000000000376000-memory.dmp

Filesize
856KB

Download